//扩展jQuery对json字符串的转换
jQuery.extend({
   /** * @see 将json字符串转换为对象 * @param json字符串 * @return 返回object,array,string等对象 */
   evalJSON: function(strJson) {
     return eval("(" + strJson + ")");
   }
});
jQuery.extend({     
    /**
    * @see 将javascript数据类型转换为json字符串  
    * @param 待转换对象,支持  object,array,string,function,number,boolean,regexp  
    * @return 返回json字符串
    */     
    toJSON:function(object){       
        var type = typeof object;       
        if ('object' == type) {         
            if (Array == object.constructor)
                type = 'array';         
            else if (RegExp == object.constructor)  
                type = 'regexp';         
            else
                type = 'object';       
        }       
        switch (type) {       
            case 'undefined':       
            case 'unknown':         
                return;          
            case 'function':       
            case 'boolean':       
            case 'regexp':         
                return object.toString();         
            case 'number':         
                return isFinite(object) ?   object.toString() : 'null';         
            case 'string':         
                return '"' + object.replace(/(|")/g, "$1").replace(/n|r|t/g, function(){           
                            var a = arguments[0];          
                            return (a == 'n') ? 'n': (a == 'r') ? 'r': (a == 't') ? 't': ""         
                        }) + '"';         
            case 'object':         
                if (object === null)
                    return 'null';         
                var results = []; 
                for (var property in object) {           
                    var value = jQuery.toJSON(object[property]);           
                    if (value !== undefined) results.push(jQuery.toJSON(property) + ':' + value);         
                }         
                return '{' + results.join(',') + '}';         
            case 'array':         
                var results = [];         
                for (var i = 0; i < object.length; i++) {           
                    var value = jQuery.toJSON(object[i]);           
                    if (value !== undefined) results.push(value);        
                }         
                return '[' + results.join(',') + ']';        
        }     
    }   
});